378 lines
9.2 KiB
C
378 lines
9.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Static daemon BFD integration.
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*
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* Copyright (C) 2020-2022 Network Device Education Foundation, Inc. ("NetDEF")
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* Rafael Zalamena
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*/
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#include <zebra.h>
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#include "lib/bfd.h"
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#include "lib/printfrr.h"
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#include "lib/srcdest_table.h"
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#include "staticd/static_routes.h"
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#include "staticd/static_zebra.h"
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#include "staticd/static_debug.h"
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#include "lib/openbsd-queue.h"
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/*
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* Next hop BFD monitoring settings.
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*/
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static void static_next_hop_bfd_change(struct static_nexthop *sn,
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const struct bfd_session_status *bss)
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{
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switch (bss->state) {
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case BSS_UNKNOWN:
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/* FALLTHROUGH: no known state yet. */
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case BSS_ADMIN_DOWN:
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/* NOTHING: we or the remote end administratively shutdown. */
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break;
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case BSS_DOWN:
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/* Peer went down, remove this next hop. */
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DEBUGD(&static_dbg_bfd,
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"%s: next hop is down, remove it from RIB", __func__);
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sn->path_down = true;
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static_zebra_route_add(sn->pn, true);
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break;
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case BSS_UP:
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/* Peer is back up, add this next hop. */
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DEBUGD(&static_dbg_bfd, "%s: next hop is up, add it to RIB",
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__func__);
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sn->path_down = false;
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static_zebra_route_add(sn->pn, true);
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break;
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}
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}
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static void static_next_hop_bfd_updatecb(
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__attribute__((unused)) struct bfd_session_params *bsp,
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const struct bfd_session_status *bss, void *arg)
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{
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static_next_hop_bfd_change(arg, bss);
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}
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static inline int
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static_next_hop_type_to_family(const struct static_nexthop *sn)
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{
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switch (sn->type) {
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case STATIC_IPV4_GATEWAY_IFNAME:
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case STATIC_IPV6_GATEWAY_IFNAME:
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case STATIC_IPV4_GATEWAY:
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case STATIC_IPV6_GATEWAY:
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if (sn->type == STATIC_IPV4_GATEWAY ||
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sn->type == STATIC_IPV4_GATEWAY_IFNAME)
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return AF_INET;
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else
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return AF_INET6;
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break;
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case STATIC_IFNAME:
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case STATIC_BLACKHOLE:
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default:
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zlog_err("%s: invalid next hop type", __func__);
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break;
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}
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return AF_UNSPEC;
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}
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void static_next_hop_bfd_monitor_enable(struct static_nexthop *sn,
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const struct lyd_node *dnode)
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{
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bool use_interface;
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bool use_profile;
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bool use_source;
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bool onlink;
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bool mhop;
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int family;
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struct ipaddr source;
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struct vrf *vrf = NULL;
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use_interface = false;
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use_source = yang_dnode_exists(dnode, "source");
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use_profile = yang_dnode_exists(dnode, "profile");
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onlink = yang_dnode_exists(dnode, "../onlink") &&
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yang_dnode_get_bool(dnode, "../onlink");
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mhop = yang_dnode_get_bool(dnode, "multi-hop");
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vrf = vrf_lookup_by_name(yang_dnode_get_string(dnode, "../vrf"));
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family = static_next_hop_type_to_family(sn);
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if (family == AF_UNSPEC)
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return;
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if (sn->type == STATIC_IPV4_GATEWAY_IFNAME ||
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sn->type == STATIC_IPV6_GATEWAY_IFNAME)
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use_interface = true;
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/* Reconfigure or allocate new memory. */
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if (sn->bsp == NULL)
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sn->bsp = bfd_sess_new(static_next_hop_bfd_updatecb, sn);
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/* Configure the session. */
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if (use_source)
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yang_dnode_get_ip(&source, dnode, "source");
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if (onlink || mhop == false)
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bfd_sess_set_auto_source(sn->bsp, false);
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else
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bfd_sess_set_auto_source(sn->bsp, !use_source);
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/* Configure the session.*/
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if (family == AF_INET)
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bfd_sess_set_ipv4_addrs(sn->bsp,
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use_source ? &source.ip._v4_addr : NULL,
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&sn->addr.ipv4);
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else if (family == AF_INET6)
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bfd_sess_set_ipv6_addrs(sn->bsp,
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use_source ? &source.ip._v6_addr : NULL,
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&sn->addr.ipv6);
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bfd_sess_set_interface(sn->bsp, use_interface ? sn->ifname : NULL);
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bfd_sess_set_profile(sn->bsp, use_profile ? yang_dnode_get_string(
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dnode, "./profile")
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: NULL);
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if (vrf && vrf->vrf_id != VRF_UNKNOWN)
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bfd_sess_set_vrf(sn->bsp, vrf->vrf_id);
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bfd_sess_set_hop_count(sn->bsp, (onlink || mhop == false) ? 1 : 254);
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/* Install or update the session. */
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bfd_sess_install(sn->bsp);
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/* Update current path status. */
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sn->path_down = (bfd_sess_status(sn->bsp) != BSS_UP);
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}
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void static_next_hop_bfd_monitor_disable(struct static_nexthop *sn)
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{
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bfd_sess_free(&sn->bsp);
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/* Reset path status. */
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sn->path_down = false;
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}
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void static_next_hop_bfd_source(struct static_nexthop *sn,
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const struct ipaddr *source)
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{
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int family;
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if (sn->bsp == NULL)
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return;
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family = static_next_hop_type_to_family(sn);
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if (family == AF_UNSPEC)
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return;
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bfd_sess_set_auto_source(sn->bsp, false);
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if (family == AF_INET)
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bfd_sess_set_ipv4_addrs(sn->bsp, &source->ip._v4_addr,
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&sn->addr.ipv4);
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else if (family == AF_INET6)
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bfd_sess_set_ipv6_addrs(sn->bsp, &source->ip._v6_addr,
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&sn->addr.ipv6);
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bfd_sess_install(sn->bsp);
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}
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void static_next_hop_bfd_auto_source(struct static_nexthop *sn)
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{
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if (sn->bsp == NULL)
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return;
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bfd_sess_set_auto_source(sn->bsp, true);
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bfd_sess_install(sn->bsp);
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}
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void static_next_hop_bfd_multi_hop(struct static_nexthop *sn, bool mhop)
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{
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if (sn->bsp == NULL)
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return;
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bfd_sess_set_hop_count(sn->bsp, mhop ? 254 : 1);
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bfd_sess_install(sn->bsp);
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}
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void static_next_hop_bfd_profile(struct static_nexthop *sn, const char *name)
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{
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if (sn->bsp == NULL)
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return;
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bfd_sess_set_profile(sn->bsp, name);
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bfd_sess_install(sn->bsp);
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}
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void static_bfd_initialize(struct zclient *zc, struct event_loop *tm)
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{
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/* Initialize BFD integration library. */
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bfd_protocol_integration_init(zc, tm);
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}
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/*
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* Display functions
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*/
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static void static_bfd_show_nexthop_json(struct vty *vty,
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struct json_object *jo,
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const struct static_nexthop *sn)
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{
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const struct prefix *dst_p, *src_p;
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struct json_object *jo_nh;
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jo_nh = json_object_new_object();
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srcdest_rnode_prefixes(sn->rn, &dst_p, &src_p);
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if (src_p)
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json_object_string_addf(jo_nh, "from", "%pFX", src_p);
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json_object_string_addf(jo_nh, "prefix", "%pFX", dst_p);
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json_object_string_add(jo_nh, "vrf", sn->nh_vrfname);
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json_object_boolean_add(jo_nh, "installed", !sn->path_down);
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json_object_array_add(jo, jo_nh);
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}
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static void static_bfd_show_path_json(struct vty *vty, struct json_object *jo,
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struct route_table *rt)
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{
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struct route_node *rn;
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for (rn = route_top(rt); rn; rn = srcdest_route_next(rn)) {
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struct static_route_info *si = static_route_info_from_rnode(rn);
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struct static_path *sp;
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if (si == NULL)
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continue;
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frr_each (static_path_list, &si->path_list, sp) {
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struct static_nexthop *sn;
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frr_each (static_nexthop_list, &sp->nexthop_list, sn) {
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/* Skip non configured BFD sessions. */
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if (sn->bsp == NULL)
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continue;
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static_bfd_show_nexthop_json(vty, jo, sn);
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}
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}
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}
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}
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static void static_bfd_show_json(struct vty *vty)
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{
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struct json_object *jo, *jo_path, *jo_afi_safi;
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struct static_vrf *svrf;
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jo = json_object_new_object();
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jo_path = json_object_new_object();
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json_object_object_add(jo, "path-list", jo_path);
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RB_FOREACH (svrf, svrf_name_head, &svrfs) {
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struct route_table *rt;
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jo_afi_safi = json_object_new_array();
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json_object_object_add(jo_path, "ipv4-unicast", jo_afi_safi);
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rt = svrf->stable[AFI_IP][SAFI_UNICAST];
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if (rt)
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static_bfd_show_path_json(vty, jo_afi_safi, rt);
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jo_afi_safi = json_object_new_array();
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json_object_object_add(jo_path, "ipv4-multicast", jo_afi_safi);
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rt = svrf->stable[AFI_IP][SAFI_MULTICAST];
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if (rt)
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static_bfd_show_path_json(vty, jo_afi_safi, rt);
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jo_afi_safi = json_object_new_array();
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json_object_object_add(jo_path, "ipv6-unicast", jo_afi_safi);
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rt = svrf->stable[AFI_IP6][SAFI_UNICAST];
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if (rt)
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static_bfd_show_path_json(vty, jo_afi_safi, rt);
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}
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vty_out(vty, "%s\n", json_object_to_json_string_ext(jo, 0));
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json_object_free(jo);
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}
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static void static_bfd_show_nexthop(struct vty *vty,
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const struct static_nexthop *sn)
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{
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vty_out(vty, " %pRN", sn->rn);
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if (sn->bsp == NULL) {
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vty_out(vty, "\n");
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return;
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}
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if (sn->type == STATIC_IPV4_GATEWAY ||
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sn->type == STATIC_IPV4_GATEWAY_IFNAME)
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vty_out(vty, " peer %pI4", &sn->addr.ipv4);
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else if (sn->type == STATIC_IPV6_GATEWAY ||
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sn->type == STATIC_IPV6_GATEWAY_IFNAME)
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vty_out(vty, " peer %pI6", &sn->addr.ipv6);
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else
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vty_out(vty, " peer unknown");
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vty_out(vty, " (status: %s)\n",
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sn->path_down ? "uninstalled" : "installed");
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}
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static void static_bfd_show_path(struct vty *vty, struct route_table *rt)
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{
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struct route_node *rn;
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for (rn = route_top(rt); rn; rn = srcdest_route_next(rn)) {
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struct static_route_info *si = static_route_info_from_rnode(rn);
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struct static_path *sp;
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if (si == NULL)
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continue;
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frr_each (static_path_list, &si->path_list, sp) {
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struct static_nexthop *sn;
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frr_each (static_nexthop_list, &sp->nexthop_list, sn) {
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/* Skip non configured BFD sessions. */
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if (sn->bsp == NULL)
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continue;
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static_bfd_show_nexthop(vty, sn);
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}
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}
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}
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}
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void static_bfd_show(struct vty *vty, bool json)
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{
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struct static_vrf *svrf;
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if (json) {
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static_bfd_show_json(vty);
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return;
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}
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vty_out(vty, "Showing BFD monitored static routes:\n");
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vty_out(vty, "\n Next hops:\n");
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RB_FOREACH (svrf, svrf_name_head, &svrfs) {
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struct route_table *rt;
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vty_out(vty, " VRF %s IPv4 Unicast:\n", svrf->name);
|
||
|
|
rt = svrf->stable[AFI_IP][SAFI_UNICAST];
|
||
|
|
if (rt)
|
||
|
|
static_bfd_show_path(vty, rt);
|
||
|
|
|
||
|
|
vty_out(vty, "\n VRF %s IPv4 Multicast:\n", svrf->name);
|
||
|
|
rt = svrf->stable[AFI_IP][SAFI_MULTICAST];
|
||
|
|
if (rt)
|
||
|
|
static_bfd_show_path(vty, rt);
|
||
|
|
|
||
|
|
vty_out(vty, "\n VRF %s IPv6 Unicast:\n", svrf->name);
|
||
|
|
rt = svrf->stable[AFI_IP6][SAFI_UNICAST];
|
||
|
|
if (rt)
|
||
|
|
static_bfd_show_path(vty, rt);
|
||
|
|
}
|
||
|
|
|
||
|
|
vty_out(vty, "\n");
|
||
|
|
}
|